Declercq, Georges (2000). Anno Domini: the origins of the Christian era. Turnhout: Brepols. ISBN2-503-51050-7. (despite beginning with 2, it is English)
Declercq, G. "Dionysius Exiguus and the Introduction of the Christian Era". Sacris Erudiri 41 (2002): 165–246. An annotated version of part of Anno Domini.
Doggett. (1992). "Calendars"Archived 8 December 2019 at the Wayback Machine. (Ch. 12), in P. Kenneth Seidelmann (Ed.) Explanatory supplement to the astronomical almanac. Sausalito, CA: University Science Books. ISBN0-935702-68-7.
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